Classification
100 - Philosophy & psychology
300 - Social sciences
320 - Political science
23
900 - History & geography
17
200 - Religion
11
330 - Economics
11
301 - Sociology & anthropology
9
370 - Education
8
700 - The arts; fine & decorative arts
7
000 - Computer science, information & general works
6
170 - Ethics
5
340 - Law
5
800 - Literature & rhetoric
5
140 - Specific philosophical schools
4
333 - Economics of land & energy
4
363 - Other social problems & services
4
400 - Language
4
600 - Technology
4
380 - Commerce, communications & transportation
2
410 - Linguistics
2
780 - Music
2
120 - Epistemology, causation & humankind
1
297 - Islam, Babism & Bahai Faith
1
304 - Factors affecting social behavior
1
361 - Social problems & social welfare in general
1
500 - Natural sciences & mathematics
1
530 - Physics
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
581 - Specific topics in natural history
1
610 - Medicine & health
1